Proverbs 10:11 (BSB)

The mouth of the righteous is a fountain of life, but the mouth of the wicked conceals violence.

From Proverbs 10. Also in the ESV.

Commentary on Proverbs 10:11

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Proverbs 10:11: See here, 1. How industrious a good man is, by communicating his goodness, to do good with it: His mouth, the outlet of his mind, is a well of life; it is a constant spring, whence issues good discourse for the edification of others, like streams that water the ground and make it fruitful, and for their consolation, like streams that quench the thirst of the weary traveller.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Proverbs 10:11: The mouth of a righteous man is a well of life,.... Like a fountain of living water, continually running and flowing with water, wholesome, reviving, and refreshing; so the righteous man's mouth, out of the abundance of his heart, overflows with good things, which minister grace to the hearers, and are for the use of edifying; things that are pleasant and profitable, grateful and acceptable...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Proverbs 10:11: a well--or, "source" of good to himself and others (Joh 7:37-38). On last clause, see on Pro 10:6.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Proverbs 10:11: Pro 10:11 Another proverb, similar to the half of Pro 10:6 : A fountain of life is the mouth of the righteous; But the mouth of the godless hideth violence. If we understand 11b wholly as 6b: os improborum obteget violentia, then the meaning of 11a would be, that that which the righteous speaks tends to his own welfare (Fl.).